>>432063This was the first bivy I made. The top is no-seeum bug netting, and it has a zipper down the center. The bottom is from an old tent footprint I had laying around. You're going to have to forgive me on my weight estimations, since I can't remember exactly how much this weighs, and my electronic scale is broken. I believe this is in the 5-6 ounce range. It's pretty good for sleeping under the stars out in the desert, and using in conjunction with a tarp.
Let me know if you are interested in the dimensions of anything I have. I mainly figured out the size through trial and error, and having other people measure around my sleeping bag with me in it.